import esphome.codegen as cg
import esphome.config_validation as cv
from esphome.components import i2c, sensor
from esphome.const import (
    CONF_ADDRESS,
    CONF_FIELD_STRENGTH_X,
    CONF_FIELD_STRENGTH_Y,
    CONF_FIELD_STRENGTH_Z,
    CONF_ID,
    ICON_MAGNET,
    STATE_CLASS_MEASUREMENT,
    UNIT_MICROTESLA,
    UNIT_DEGREES,
    ICON_SCREEN_ROTATION,
    CONF_UPDATE_INTERVAL,
)

DEPENDENCIES = ["i2c"]

mmc5603_ns = cg.esphome_ns.namespace("mmc5603")

CONF_HEADING = "heading"

MMC5603Component = mmc5603_ns.class_(
    "MMC5603Component", cg.PollingComponent, i2c.I2CDevice
)


MMC5603Datarate = mmc5603_ns.enum("MMC5603Datarate")
MMC5603Datarates = {
    75: MMC5603Datarate.MMC5603_DATARATE_75_0_HZ,
    150: MMC5603Datarate.MMC5603_DATARATE_150_0_HZ,
    255: MMC5603Datarate.MMC5603_DATARATE_255_0_HZ,
}


field_strength_schema = sensor.sensor_schema(
    unit_of_measurement=UNIT_MICROTESLA,
    icon=ICON_MAGNET,
    accuracy_decimals=1,
    state_class=STATE_CLASS_MEASUREMENT,
)
heading_schema = sensor.sensor_schema(
    unit_of_measurement=UNIT_DEGREES,
    icon=ICON_SCREEN_ROTATION,
    accuracy_decimals=1,
)

CONFIG_SCHEMA = (
    cv.Schema(
        {
            cv.GenerateID(): cv.declare_id(MMC5603Component),
            cv.Optional(CONF_ADDRESS): cv.i2c_address,
            cv.Optional(CONF_FIELD_STRENGTH_X): field_strength_schema,
            cv.Optional(CONF_FIELD_STRENGTH_Y): field_strength_schema,
            cv.Optional(CONF_FIELD_STRENGTH_Z): field_strength_schema,
            cv.Optional(CONF_HEADING): heading_schema,
        }
    )
    .extend(cv.polling_component_schema("60s"))
    .extend(i2c.i2c_device_schema(0x1E))
)


def auto_data_rate(config):
    interval_msec = config[CONF_UPDATE_INTERVAL].total_milliseconds
    interval_hz = 1000.0 / interval_msec
    for datarate in sorted(MMC5603Datarates.keys()):
        if float(datarate) >= interval_hz:
            return MMC5603Datarates[datarate]
    return MMC5603Datarates[75]


async def to_code(config):
    var = cg.new_Pvariable(config[CONF_ID])
    await cg.register_component(var, config)
    await i2c.register_i2c_device(var, config)

    cg.add(var.set_datarate(auto_data_rate(config)))
    if CONF_FIELD_STRENGTH_X in config:
        sens = await sensor.new_sensor(config[CONF_FIELD_STRENGTH_X])
        cg.add(var.set_x_sensor(sens))
    if CONF_FIELD_STRENGTH_Y in config:
        sens = await sensor.new_sensor(config[CONF_FIELD_STRENGTH_Y])
        cg.add(var.set_y_sensor(sens))
    if CONF_FIELD_STRENGTH_Z in config:
        sens = await sensor.new_sensor(config[CONF_FIELD_STRENGTH_Z])
        cg.add(var.set_z_sensor(sens))
    if CONF_HEADING in config:
        sens = await sensor.new_sensor(config[CONF_HEADING])
        cg.add(var.set_heading_sensor(sens))